[PATCH v3] kbuild: deb-pkg: Don't fail if modules.order is missing

[PATCH v3] kbuild: deb-pkg: Don't fail if modules.order is missing

[Matt Fleming]

From: Matt Fleming <mfleming@cloudflare.com>

Kernels built without CONFIG_MODULES might still want to create -dbg deb
packages but install_linux_image_dbg() assumes modules.order always
exists. This obviously isn't true if no modules were built, so we should
skip reading modules.order in that case.

Fixes: 16c36f8864e3 ("kbuild: deb-pkg: use build ID instead of debug link for dbg package")
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-kbuild@vger.kernel.org
Signed-off-by: Matt Fleming <mfleming@cloudflare.com>
---

Changes in v3:
 - Wrap modules.order logic in 'if is_enabled CONFIG_MODULES'

 scripts/package/builddeb | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 441b0bb66e0d..fb686fd3266f 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -96,16 +96,18 @@ install_linux_image_dbg () {
 
 	# Parse modules.order directly because 'make modules_install' may sign,
 	# compress modules, and then run unneeded depmod.
-	while read -r mod; do
-		mod="${mod%.o}.ko"
-		dbg="${pdir}/usr/lib/debug/lib/modules/${KERNELRELEASE}/kernel/${mod}"
-		buildid=$("${READELF}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
-		link="${pdir}/usr/lib/debug/.build-id/${buildid}.debug"
-
-		mkdir -p "${dbg%/*}" "${link%/*}"
-		"${OBJCOPY}" --only-keep-debug "${mod}" "${dbg}"
-		ln -sf --relative "${dbg}" "${link}"
-	done < modules.order
+	if is_enabled CONFIG_MODULES; then
+		while read -r mod; do
+			mod="${mod%.o}.ko"
+			dbg="${pdir}/usr/lib/debug/lib/modules/${KERNELRELEASE}/kernel/${mod}"
+			buildid=$("${READELF}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
+			link="${pdir}/usr/lib/debug/.build-id/${buildid}.debug"
+
+			mkdir -p "${dbg%/*}" "${link%/*}"
+			"${OBJCOPY}" --only-keep-debug "${mod}" "${dbg}"
+			ln -sf --relative "${dbg}" "${link}"
+		done < modules.order
+	fi
 
 	# Build debug package
 	# Different tools want the image in different locations
-- 
2.34.1

Re: [PATCH v3] kbuild: deb-pkg: Don't fail if modules.order is missing

[Masahiro Yamada]

On Fri, Nov 8, 2024 at 12:05 AM Matt Fleming <matt@readmodwrite.com> wrote:
>
> From: Matt Fleming <mfleming@cloudflare.com>
>
> Kernels built without CONFIG_MODULES might still want to create -dbg deb
> packages but install_linux_image_dbg() assumes modules.order always
> exists. This obviously isn't true if no modules were built, so we should
> skip reading modules.order in that case.
>
> Fixes: 16c36f8864e3 ("kbuild: deb-pkg: use build ID instead of debug link for dbg package")
> Cc: Masahiro Yamada <masahiroy@kernel.org>
> Cc: linux-kbuild@vger.kernel.org
> Signed-off-by: Matt Fleming <mfleming@cloudflare.com>


Applied to linux-kbuild.
Thanks!

> ---
>
> Changes in v3:
>  - Wrap modules.order logic in 'if is_enabled CONFIG_MODULES'
>
>  scripts/package/builddeb | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/scripts/package/builddeb b/scripts/package/builddeb
> index 441b0bb66e0d..fb686fd3266f 100755
> --- a/scripts/package/builddeb
> +++ b/scripts/package/builddeb
> @@ -96,16 +96,18 @@ install_linux_image_dbg () {
>
>         # Parse modules.order directly because 'make modules_install' may sign,
>         # compress modules, and then run unneeded depmod.
> -       while read -r mod; do
> -               mod="${mod%.o}.ko"
> -               dbg="${pdir}/usr/lib/debug/lib/modules/${KERNELRELEASE}/kernel/${mod}"
> -               buildid=$("${READELF}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
> -               link="${pdir}/usr/lib/debug/.build-id/${buildid}.debug"
> -
> -               mkdir -p "${dbg%/*}" "${link%/*}"
> -               "${OBJCOPY}" --only-keep-debug "${mod}" "${dbg}"
> -               ln -sf --relative "${dbg}" "${link}"
> -       done < modules.order
> +       if is_enabled CONFIG_MODULES; then
> +               while read -r mod; do
> +                       mod="${mod%.o}.ko"
> +                       dbg="${pdir}/usr/lib/debug/lib/modules/${KERNELRELEASE}/kernel/${mod}"
> +                       buildid=$("${READELF}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
> +                       link="${pdir}/usr/lib/debug/.build-id/${buildid}.debug"
> +
> +                       mkdir -p "${dbg%/*}" "${link%/*}"
> +                       "${OBJCOPY}" --only-keep-debug "${mod}" "${dbg}"
> +                       ln -sf --relative "${dbg}" "${link}"
> +               done < modules.order
> +       fi
>
>         # Build debug package
>         # Different tools want the image in different locations
> --
> 2.34.1
>


-- 
Best Regards
Masahiro Yamada